Shaft-furnace



yC. GIESECKE.

SHAFT FURNACE.

APPLICATION FILED MAR. 2.7, |917.

1,399,297. Patented D60, 6, 1921.

2 SHEETS-SHEET I.

nllgg/Ilm @Wl 11 ffl y r Znveiz for' Zaz@ @jj/l br? @w68 @We C. GIESECKE.

SHAFT FUBNACE.

' APPLICATION FILED IIIAII. 2l. 1911.

Patented Dec. 6, 1921.

2 SHEETS-SHEET 2.

III I PATENT oFFlcE.

CARL GIESECKE, 0F BAD HARZBURG, GERMANY.

SHAFT-Formaat;

Specification of Letters Patent.

Patented Dee. 6, 1921.

Application led March 27, 1917. Serial No. 157,741.

(GRANTED UNDER THE yPROVISIONS 0F THE ACT 0F MARCH 3, 1921, 41 STAT. L., 1313.)

To all wit-omit may concern:

Be it known that I, CARL Gmsncxn, engineer, a citizen of the German Republic, residing at Bad Harzburg, Germany, have invented certain new `and useful Improvements in Shaft-Furnaces, of which the following is a specification.

My present invention relates to shaft furnaces and in particular to shaft furnaces of the type in which preliminarily shaped pieces are agglomerated. It is a principal object of my present invention to provide improvements in the construction of shaft furnaces of such a type whereby I am enabled not only to discharge the contents of the furnace in a continuous and regular order but to remove the pieces which have been solidified by the action of the furnace heat, from the furnace without demolishing them to anyv extent and also without producing any substantial dust formation due to levigation. It is a further object of my invention to provide improved means for mechanically discharging the treated contents of the furnaces in a continuous and regular manner. It is a further object of my invention to provide improved means whereby the individual pieces treated within the furnace and which may have become joined owing to a sintering of their surfaces, are mechanically separated from each other prior to or during the discharge.

With these and other objects in view, I give the furnace a construction whereb the sintered pieces may be removed wit out compressing them and without any application of force. To this end, I construct the furnace so that the charges to be removed pass through a furnace space of increasing sectional area. Further features of my invention will be specifically described hereinafter.

In order to illustrate the novel structural features by means of which I may attain these and other objects, I have shown some practical embodiments of my'invention in the accompanying'drawings, by way of example.

Figure 1 is an elevation, partly in section, of a shaft furnace according-to my invention. Fig. 2 is a plan view of some parts shown in Fig. l. Fig. 3 is a view similar to Fig. 1, illustrating a modified construcnormally charged with sintered pieces. The

core may consist of cast iron and I prefer to make the same hollow and to utilize the hollow space for the introduction of air into the interior of the furnace. In Fig. 1 I have shown the outer furnace wall as being of substantially cylindrical shape but for its lower termination. In order to obtain an interior furnace space of gradually increasing sectional area, in downward direction, the said core b may be of decreasing diameter toward the furnace bottom.L As shown in Fig. 6, I may give the furnace shaft a the shape of a cone having its base coinciding with the furnace bottom. In such a case, the core may be cylindrical, or may also be of the shape of a cone, as shown in Fig. 6. The essential feature according to my'present yinvention is that the interior furnace space as determined by the di` ameters D and CZ, see Fig. 1 and Fig. 6, is of steadily increasing sectional area.

By this construction, those obstructions that normally oppose a ready discharge of the treated furnace contents, are reduced to a minimum, and the production of unnecessary pressure is obviated thereby. This avoidance of pressure involves a reduction of friction whereby any undesirable demolition or levigation of the individual agglomerated pieces is prevented.

wIn order to obtain an effective closure at the open discharge end of the furnace and thereby to insure a regular discharge and prevent a casual rolling off of thelarger ball-like enroll-like pieces treated `within the furnace heat, I provide for the formation of an annular pile immediately below the discharge opening :of the furnace. To

Athat end, I provide the furnace bottom `which is lpreferably slightly inclined to? with a stowing ring or flange z'.

v parts. VIf desired. the stowingjfiange z' may ward the circumferential discharge opening, In the illustrated embodiment the furnace bottom is shown to be of the for-m of a dish or plate h from which the circumferential stoWing ilange z' projects upward and prevents the pieces lying immediately upon the disk from rolling oit. As I have shown in Fig; 7 in a plan view, the stowing flange v1 need not be continuous and may be composed of several be made adjustable.

The piecesthusaccumulating in front of thestovvir'igl..` ring form a baselayer for the superposed layers ofbalLlike and roll-like pieces pilingthereon and which are prevented by said. comparatively stationary base, layer from sliding off. `Inorder to constantlyiremove from :the pile the excess radially outward I provide revolving clearing members f as shown in Figs. l and 2. These clearing members may be of'any approved structure, they arefpreferably mounted on `a revoluble table ato which a revolving motion is trans? mitted from any suitable source of power, by

Vmeans of the worm gearing m, n, indicated ini the drawings. By means of the revolving clearing device, a regular operation ofthe furnace can be obtained the discharging action beingthereby adjustable. exactly in cor-Y respondence to the time; occupied byA the Y burningl action upon'a furnace. charge; As

shownin the drawings, the clearing members f. are structures having an outer" edgel ofa iral curvature which exerts a pushing ac-` t1on upon the portion to be displaced off the pile. Y

In order to automatically separate any adhering pieces prior to or during the discharge, I have further provided a device .whereby the continually sinking charge is periodically slightly raised and thereupon allowed to drop the dropping action producing the desired separation of any adhering pieces. To this end, the clearing members f are provided ontheir top Awith screw-like rising and abruptly terminating facesA c formed by wedgelike `bodies to which thus is-allotted a dual function, viz. producinga circumferential clearing motion by meansfof the edge facesv f anda raising and dropping motion by means ofthe top faces c; While these bodies of dual function are revolving they produce a relative shifting movement in alternate directions, of the pieces forming the furnace charge; and in conjunction withv the sudden dropping motion the desired separation effect is obtained in an easy and f effective manner.

'1`hefscrew` shaped` raising or` lifting faces c, instead of being disposed below the fur;V nacemouth, maybe located within the same.V In the embodimentillustrated in Fig. 3, the screw sha jd lifting faces c areshown. turbe mnun upon a cone. d which facili'- faces 'e 'and thedftingrfacesc are formed on separate members arranged in alternate order upon the supporting disk 7a which may also be of conical shape,jsuch as shown in Fig.` 3. Y, In the embodiment shown in Fig. 5, both motions, viz. the radial displacing motion andA the axial liftingmotion, are `produced vby the members g which represent screw shaped bodies`u mountedV upon a cone Z. W'henthe cone Zis caused to revolve by means- `of the power transmitting gearing. m, n, Vthe mass of thefurnace' contents resting uponV the structureel, g, is axially raised and dropped `and simultaneously displaced outward in radial directiomzby. meansiof the screw shaped facesfg owing 'to their oblique disposition. 1 i U FromV the. description asgiven hereinbefore, it will be obvious that the scope of'my invention -isnot` to be restricted to the particular structural means shown in the drawing by way of-example; but that I may employ diferentstructural means for obtaining the desiredf effectswithout thereby departing from th'e'scope` and spirit4 of my invention.

What I claim. aswmy' invention and? desire to secure 1 byf Letters 1 Patent of; the: YUnited 915. Ina'ldevi'ce ofithe character set forth, the combination of atubular member hav# ing al discharge opening-at its lower end. and af coredisposed withinthat part of the member through' which sintered pieces are caused 'to'passw and: also extending through said discharge opening, said core being of such a shapey that the` available member space increases in'sectional area toward the discharge opening of the member.v

2L A device-of the character set forth come prising, in combination, a tubular member havinga discharge opening at the lowerend thereof, said member provided with an interiorspace "of steadily increasing sectional area toward'saiddischarge opening7 a core disposed within thatipart of the memberl through' whichsintere'd and extending pieces are-caused to pass, and a bottom member having af stowingrim. extending within said discharge opening.Y 1

3. A device of the character set forth comprising, in combination, a tubular member having a discharge opening,'a bottom below said opening,fa core disposed above said bot Y saidf*bottomV and below `.the Adischarge openL ing and adapted to displacingly remove the treated charge through said discharge opening, l

4. A device ofthe character set forth comprising, in combination, a tubular member having a discharge opening at the lower end thereof, said member having an interior space of steadily increasing sectional area toward said discharge opening, a bottombelow said discharge opening having a stowing rim within lsaid opening, and revoluble clearing means disposed above the level of said stowing rim and below the discharge opening and adapted to continually remove a portion of the stowed charge by a displacing action through said discharge opening.

5. A device of the character set forth comprising. in combination, a tubular member having a discharge opening at the lower end thereof, said member having an interior space of st adily increasing sectional area toward said discharge opening, a bottom member below the discharge opening having a. stowing rim extending wit-hin said opening, and means for periodically raising and dropping the charge above said bottom.

6, A device of the character set forth comprising, in combination, a tubular member having a discharge opening at the lower end thereof, said member having an interior space of steadily increasing sectional area. ward said discharge opening, a core disposed within that part or the member through which sintered pieces are caused to pass, a bottom member having a stowing rim extending within said discharge opening, and revoluble means disposed above the level of said stowing rim below the dis charge opening and adapted to periodically raise and drop the charge above said bottom.

'7. A device of the character set forth comprising, in combination, a tubular member having a discharge opening at the lower end thereof, said member having an interior space of steadily increasing sectional area toward said discharge opening, a bottom below the discharge opening having a stowing rim extending within said discharge openingn revoluble clearing means disposed above the level of said stowing rim and adapted to continually remove a portion of the stowed charge by a displacing action through said discharge opening, and revoluble means disposed above said bottom and adapted to periodically raise and drip the charge.

S. A shaft furnace of the character set fort-h comprising, in combination, a tubular member having a lower discharge opening,

a bottom plate below said opening, a stowing rim on said bottom plate and extending within said discharge opening, a core disposed within that part of the member through which sintered pieces are caused to pass, said member and core being of such relative shapes that the available space between them steadily increases in sectional area toward said discharge opening, revoluble clearing means dispo-sed above the level of said stowing rim and adapted to produce a radial displacing action upon the charge stowed within said dicharge` opening, and revoluble means disposed above said bottom plate and adapted to periodically raise and drop the charge, whereby any adhering pieces of the sintered charge are caused to separate,

9, A device of the character set forth comprising, in combination, a tubular member having a lower discharge opening, a bottom below said opening, a core disposed above said bottom extending through that part of the member through which sintered pieces are caused to pass, said member and core having such relative shapes that the available space between them steadily increases in'seotiona-l area toward said discharge opening, and revoluble means disposed above said bottom and adapted to simultaneously produce a radial displacing action upon the stowed charge and an axial raising' and dropping movement of the charge.

l0. A device of the character set forth comprising, in combination, a tubular mombor having a lower discharge opening, a bottoni plate below said opening and having a stowing rim extending within said discharge opening, a core disposed above said bottom plato and extending through that part of the member through which sintered pieces are caused to pass, said member and core being of such relative shapes that the available space between them steadily increases in sectional area toward said discharge opening, and revoluble means disposed above the level of said stowing rim and adapted to simultaneously produce a radial displacing action upon the stowed charge and raising and dropping movement within the chargeresting on said bot-tom plate.

In testimony whereof i have hereunto set my hand in presence of two subscribing witnesses.

CAR-L GIESEGKE.

Witnesses AUGUST LAsrInR, AUGUST SoHFnR. 

